import org.apache.hadoop.fs.viewfs.InodeTree; //导入依赖的package包/类
@Test(expected=FileAlreadyExistsException.class)
public void testInvalidConfig() throws IOException, URISyntaxException {
  Configuration conf = new Configuration();
  ConfigUtil.addLink(conf, "/internalDir/linkToDir2",
      new Path("file:///dir2").toUri());
  ConfigUtil.addLink(conf, "/internalDir/linkToDir2/linkToDir3",
      new Path("file:///dir3").toUri());
  
  class Foo { };
  
   new InodeTree<Foo>(conf, null) {

    @Override
    protected
    Foo getTargetFileSystem(final URI uri)
      throws URISyntaxException, UnsupportedFileSystemException {
        return null;
    }

    @Override
    protected
    Foo getTargetFileSystem(
        org.apache.hadoop.fs.viewfs.InodeTree.INodeDir<Foo>
                                        dir)
      throws URISyntaxException {
      return null;
    }

    @Override
    protected
    Foo getTargetFileSystem(URI[] mergeFsURIList)
        throws URISyntaxException, UnsupportedFileSystemException {
      return null;
    }
  };
}